PLATE 8. 



Crassostrea lugardi, sp. nov. 

 FIG. i. Interior of an upper valve. 



Ostrea cf. ludensis (Deshayes). 

 FlG. 2. Interior of an upper valve. 



FIG. 3. An enlarged external view of same valve to exhibit the radio-longitudinal 

 striations. x 2\. 



Anadara nigeriensis, sp. nov. 



FIG. 4. Umbonal view of example with closed valves. 

 FlG. 5. Ventral view of smaller specimen with closed valves showing the scalloped 



margins. 



FlG. 6. Internal aspect of a left valve of large size. 

 FlG. 7. Interior of a medium sized right valve. 



Glycymeris nigeriensis, sp. nov. 



FlG. 8. Outer view of a right valve showing closely costated surface. 

 FlG. 9. Inner view of left valve of probably the same example. 

 FlG. 10. Example with closed valves giving the umbonal aspect. 



Striarca africana, sp. nov. 



FlG. ii. Dorsal view of example with closed valves. 

 FlG. 12. Interior of a right valve. 

 FlG. 13. External sculpture characters. X 3. 



Fossularca afrioana, sp. nov. 



FIG. 14. Umbonal view of specimen with closed valves. 

 FlG. 15. Exterior of a right valve. 

 FlG. 16. Interior of a right valve of another specimen. 

 FlG. 17. Interior of a left valve of another specimen. 



Phacoides eaglesomei, sp. nov. 



FlG. 1 8. External view of right valve. 



FlG. 19. Interior of a left valve of another specimen showing the narrowly elongate, 



anterior adductor scar. 

 FlG. 20. Interior of right valve. 



These three figures are slightly enlarged. 



